Two of the best ways to do this are (1) by using Create Block Theme plugin or a (2) Child theme. Why complicate it with a new plugin?
In the child theme, create a templates folder, and in that, add a custom-template.html file.
You can also add a new template by using the Plus + button on top to add a new template and export it as either a new theme or as a child theme using Create Block Theme
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